War Submarine

What this basic probability question tests

This is an easy probability question that tests whether you can correctly model independent events and combine their probabilities. It's a foundational problem type used in screening interviews to confirm you can set up and solve a straightforward scenario without algebra mistakes.

The core skill being probed is understanding when to use complement reasoning versus direct enumeration, and how to handle the logic of "at least one success" across multiple trials. Even though the numbers are simple, the question rewards clear thinking about what "hits its target" means when multiple shots are fired.

• Independent events and multiplication rule
• Complement probability (the logical inverse)
• Distinguishing "at least one" from "exactly one"